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Economics, as we know it, is the social science concerned with the production, distribution, exchange, and consumption of goods and services. Economists focus on the way in which individuals, groups, business enterprises, and governments seek to achieve efficiently any economic objective they select. (46)Other fields of study also contribute to this knowledge: Psychology and ethics try to explain how objectives are formed, history records changes in human objectives, and sociology interprets human behavior. in social contexts. Standard economics can be divided into two major fields. (47)The first, price theory or microeconomics, explains how the interplay of supply and demand in competitive markets creates a multitude of individual prices, wage rates, profit margins, and rental changes. Microeconomics assumes that people behave rationally. Consumers try to spend their income in ways that give them as much pleasure as possible. As economists say, they maximize utility. For their part, entrepreneurs seek as much profit as they can extract from their operations. The second field, macroeconomics, deals with modern explanations of national income and employment. Macroeconomics dates from the book, The General Theory of Employment, Interest, and Money (1935), by the British economist John Maynard Keynes. His explanation of prosperity and depression centers on the total or aggregate demand for goods and services by consumers, business investors, and governments. (48)Because, according to Keynes, inadequate total demand increases unemployment, the indicated cure is either more investment by businesses or more spending and consequently larger budget deficits by government. Economic issues have occupied peoples minds throughout the ages. (49)Aristotle and Plato in ancient Greece wrote about problems of wealth, property, and trade, both of whom were prejudiced against commerce, feeling that to live by trade was undesirable. The Romans borrowed their economic ideas from the Greeks and showed the same contempt for trade. (50)During the Middle Ages the economic ideas of the Roman Catholic church were expressed in the law of the church, which condemned the taking of interest for money loaned and regarded commerce as inferior to agriculture. Economics as a subject of modern study, distinguishable from moral philosophy and politics, dates from the work, Inquiry into the Nature and Causes of the Wealth of Nations (1776), by the Scottish philosopher and economist Adam Smith. Mercantilism and physiocracy were precursors of the classical economics of Smith and his 19th-century successors.

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其他领域的研究也有助于对此理解:心理学和伦理学试图解释目标是如何形成的历史记录着人们所追求的目标的变化社会学则从社会环境的角度来解释人们的行为。
本题考核的知识点是:并列分句、后置定语。该句子中冒号后是并列的三个简单句。第一个分句中how引导的从句做explain的宾语;第二个和第三个分句中......

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未分类题All great writers express their ideas in an individual way: it is often possible to determine the authorship of a literary passage from the style. in which it is written; (46)Many authors feel that the conventions of the written language hamper them and they use words freely, with little observance of accepted grammar and sentence structure, in order to convey vividly their feelings, beliefs and fantasies. Others with a deep respect for traditional usage achieve a style. of classical clearness and perfection or achieve effects of visual or musical beauty by their mastery of existing forms enriched by a sensitive and adventurous vocabulary, vivid imagery and a blending of evocative vowels and consonants. Young people often feel the need to experiment and, as a result, to break away from the traditions they have been taught. In dealing with a foreign language, however, they have to bear in mind two conditions for experiment. (47)Any great experimental artist is fully familiar with the conventions from which he wishes to break free: he is capable of achievement in established forms but feels these are inadequate for the expression of his ideas. In the second place, he is indisputably an outstanding artist who has something original to express; otherwise the experiments will appear pretentious, even childish. Few students can achieve so intimate an understanding of a foreign language that they can explore its resources freely and experimentally. Not all feel the need to do so. (48)And in any case examination candidates need to become thoroughly acquainted with conventional usage as it is a sure knowledge of accepted forms that examiners look for. The student undertaking a Proficiency course should have the ability to use simple English correctly to express everyday facts and ideas. (49)This ability to express oneself in a foreign language on a basis of thinking in that language without reference to ones own is essential at all stages of learning. Students with extensive experience in translation who have had little practice in using the foreign language directly must, above all, write very simply at first, using only easy constructions which they are convinced are correct, forgetting for the time being their own language and rigorously avoiding translating from it. More complex forms, more varied vocabulary and sentence structure should evolve naturally in step with the students increasing knowledge of the language. The student introduces a certain form. of construction only when he is thoroughly familiar with it and is certain that it is normally used in this way. As he achieves additional confidence, he can begin to take an interest in use of the language to create diverse effects. He may want to convey impressions of suspense, calm, dignity, humor, of music or poetry. (50)He will master the art of logical explanation, of exact letter writing, of formal speeches and natural conversation and of vivid impressionistic description. But he will still write within the limits of his ability and knowledge. And, as a learner, he will still be studying and observing conventional English usage in all that he writes.